2021 REVISION (Paper Class) PTT - 65 Paper එක ලෙස අද දින (29 | 🔴 2021 Chemistry - OSMAN JAYASINGHE...🎓

I'm a graduate of the University of Ruhuna,paper marking examiner-chemistry in Advanced Level examination since 2003 and also a government teacher.I have produced outstanding and unbeatable results in...